Subnautica: Below Zero is a stand-alone expansion to 2018's Subnautica featuring an entirely different character on the mysterious Planet 4546B. After the Aurora crash, the Alterra Corporation has decided to send another expedition to the icy north of the planet in search of more alien technology and usable science. Unfortunately, a terrible storm destroys your research base, stranding you with little in the way of supplies or backup.

Unlike its predecessor, you're not entirely alone in Subnautica: Below Zero. You have a little help from a friend in an orbital space station, although they won't be able to give you everything you need. Dive back underwater and explore all of the riches that Planet 4546B has to offer!

Subnautica: Below Zero aims to build on the success of Subnautica. As a bonus, the use of the same engine and many of the previous game's assets will mean that the Steam Early Access period should be much shorter this time around — less than a year in total!

Below Zero is an underwater adventure game set on an alien ocean world. It is a new chapter in the Subnautica universe and is currently in development by Unknown Worlds.

Watch out!

Below Zero is not finished! It is in active development: Full of bugs, missing features, and performance issues. If you would like to play Below Zero when it is finished, follow our development progress. We'll keep you informed as updates improve the game.

Return to planet 4546B

Dive into a freezing underwater adventure. Below Zero is set in an arctic region of planet 4546B. As a scientist posted to a research station on the planet's surface, you are tasked with studying alien artifacts...

The Vesper space station orbits high above you, sending supplies, instructions, and receiving samples you launch from the surface. When disaster strikes the research station, you must improvise to survive: Construct habitats, scavenge for resources, hunt for food, and craft equipment.\

Discover new lifeforms in the icy depths of 4546B. Swim through the giant Titan Holefish, escape from the aggressive Brute Shark, and visit the adorable Pengwings. Some residents of the frozen ocean will help you, and some might try to harm you.

An ocean of intrigue

Who were the aliens who came here before? Why were they on this planet? Can you trust your commanders? Below Zero extends the story of the Subnautica universe, diving deep into the mystery introduced in the original game. Open up new story elements with every Early Access update.